CONV-259: Create CreditPack DTO

[menvil]

Summary

• Adds App\Data\Billing\CreditPackDto as a final readonly class
• fromConfig(string $key, array $config): self factory validates required keys and throws InvalidArgumentException on missing fields
• Maps key, label, credits, stripePriceId, description

Test plan

• tests/Unit/Billing/CreditPackDtoTest.php — tests construction from config and missing key validation
• composer test passes (461 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Add a final readonly CreditPackDto to model billing credit packs, with a fromConfig factory that validates required keys and maps key, label, credits, stripePriceId, and description. Implements CONV-259 with unit tests for construction and missing-key errors.

^{Written for commit b0beaab. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-259-create-credit-pack-dto

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